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view libs/assimp/LineSplitter.h @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
line source
1 /*
2 Open Asset Import Library (assimp)
3 ----------------------------------------------------------------------
5 Copyright (c) 2006-2012, assimp team
6 All rights reserved.
8 Redistribution and use of this software in source and binary forms,
9 with or without modification, are permitted provided that the
10 following conditions are met:
12 * Redistributions of source code must retain the above
13 copyright notice, this list of conditions and the
14 following disclaimer.
16 * Redistributions in binary form must reproduce the above
17 copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
21 * Neither the name of the assimp team, nor the names of its
22 contributors may be used to endorse or promote products
23 derived from this software without specific prior
24 written permission of the assimp team.
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 ----------------------------------------------------------------------
39 */
41 /** @file LineSplitter.h
42 * @brief LineSplitter, a helper class to iterate through all lines
43 * of a file easily. Works with StreamReader.
44 */
45 #ifndef INCLUDED_LINE_SPLITTER_H
46 #define INCLUDED_LINE_SPLITTER_H
48 #include <stdexcept>
50 #include "StreamReader.h"
51 #include "ParsingUtils.h"
53 namespace Assimp {
55 // ------------------------------------------------------------------------------------------------
56 /** Usage:
57 @code
58 for(LineSplitter splitter(stream);splitter;++splitter) {
60 if (*splitter == "hi!") {
61 ...
62 }
63 else if (splitter->substr(0,5) == "hello") {
64 ...
65 // access the third token in the line (tokens are space-separated)
66 if (strtol(splitter[2]) > 5) { .. }
67 }
69 std::cout << "Current line is: " << splitter.get_index() << std::endl;
70 }
71 @endcode */
72 // ------------------------------------------------------------------------------------------------
73 class LineSplitter
74 {
75 public:
77 typedef size_t line_idx;
79 public:
81 // -----------------------------------------
82 /** construct from existing stream reader
83 note: trim is *always* assumed true if skyp_empty_lines==true
84 */
85 LineSplitter(StreamReaderLE& stream, bool skip_empty_lines = true, bool trim = true)
86 : stream(stream)
87 , swallow()
88 , skip_empty_lines(skip_empty_lines)
89 , trim(trim)
90 {
91 cur.reserve(1024);
92 operator++();
94 idx = 0;
95 }
97 public:
99 // -----------------------------------------
100 /** pseudo-iterator increment */
101 LineSplitter& operator++() {
102 if(swallow) {
103 swallow = false;
104 return *this;
105 }
107 if (!*this) {
108 throw std::logic_error("End of file, no more lines to be retrieved.");
109 }
111 char s;
113 cur.clear();
114 while(stream.GetRemainingSize() && (s = stream.GetI1(),1)) {
115 if (s == '\n' || s == '\r') {
116 if (skip_empty_lines) {
117 while (stream.GetRemainingSize() && ((s = stream.GetI1()) == ' ' || s == '\r' || s == '\n'));
118 if (stream.GetRemainingSize()) {
119 stream.IncPtr(-1);
120 }
121 }
122 else {
123 // skip both potential line terminators but don't read past this line.
124 if (stream.GetRemainingSize() && (s == '\r' && stream.GetI1() != '\n')) {
125 stream.IncPtr(-1);
126 }
128 if (trim) {
129 while (stream.GetRemainingSize() && ((s = stream.GetI1()) == ' ' || s == '\t'));
130 if (stream.GetRemainingSize()) {
131 stream.IncPtr(-1);
132 }
133 }
134 }
136 break;
137 }
138 cur += s;
139 }
141 ++idx;
142 return *this;
143 }
145 // -----------------------------------------
146 LineSplitter& operator++(int) {
147 return ++(*this);
148 }
150 // -----------------------------------------
151 /** get a pointer to the beginning of a particular token */
152 const char* operator[] (size_t idx) const {
153 const char* s = operator->()->c_str();
155 SkipSpaces(&s);
156 for(size_t i = 0; i < idx; ++i) {
158 for(;!IsSpace(*s); ++s) {
159 if(IsLineEnd(*s)) {
160 throw std::range_error("Token index out of range, EOL reached");
161 }
162 }
163 SkipSpaces(&s);
164 }
165 return s;
166 }
168 // -----------------------------------------
169 /** extract the start positions of N tokens from the current line*/
170 template <size_t N>
171 void get_tokens(const char* (&tokens)[N]) const {
172 const char* s = operator->()->c_str();
174 SkipSpaces(&s);
175 for(size_t i = 0; i < N; ++i) {
176 if(IsLineEnd(*s)) {
177 throw std::range_error("Token count out of range, EOL reached");
178 }
179 tokens[i] = s;
181 for(;*s && !IsSpace(*s); ++s);
182 SkipSpaces(&s);
183 }
184 }
186 // -----------------------------------------
187 /** member access */
188 const std::string* operator -> () const {
189 return &cur;
190 }
192 std::string operator* () const {
193 return cur;
194 }
196 // -----------------------------------------
197 /** boolean context */
198 operator bool() const {
199 return stream.GetRemainingSize()>0;
200 }
202 // -----------------------------------------
203 /** line indices are zero-based, empty lines are included */
204 operator line_idx() const {
205 return idx;
206 }
208 line_idx get_index() const {
209 return idx;
210 }
212 // -----------------------------------------
213 /** access the underlying stream object */
214 StreamReaderLE& get_stream() {
215 return stream;
216 }
218 // -----------------------------------------
219 /** !strcmp((*this)->substr(0,strlen(check)),check) */
220 bool match_start(const char* check) {
221 const size_t len = strlen(check);
223 return len <= cur.length() && std::equal(check,check+len,cur.begin());
224 }
227 // -----------------------------------------
228 /** swallow the next call to ++, return the previous value. */
229 void swallow_next_increment() {
230 swallow = true;
231 }
233 private:
235 line_idx idx;
236 std::string cur;
237 StreamReaderLE& stream;
238 bool swallow, skip_empty_lines, trim;
239 };
241 }
242 #endif // INCLUDED_LINE_SPLITTER_H